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freebsd-nq/sys/kern/subr_bus.c
Doug Rabson c3654b5c4d A few small improvements to the bus code: 
* A function device_printf() to make pretty-printing driver messages easier.
* A function device_get_children() to query the children of a device.
* Generic implementations of BUS_ALLOC_RESOURCE and BUS_RELEASE_RESOURCE.
* Change bus_generic_print_child() so that it is actually useful.
1999-01-16 17:44:09 +00:00

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/*-
* Copyright (c) 1997,1998 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: subr_bus.c,v 1.13 1999/01/10 22:04:05 n_hibma Exp $
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus_private.h>
#include <sys/systm.h>
#include <machine/stdarg.h> /* for device_printf() */
#include "opt_bus.h"
#ifdef BUS_DEBUG
#define PDEBUG(a) (printf(__FUNCTION__ ":%d: ", __LINE__), printf a, printf("\n"))
#define DEVICENAME(d) ((d)? device_get_name(d): "no device")
#define DRIVERNAME(d) ((d)? d->name : "no driver")
#define DEVCLANAME(d) ((d)? d->name : "no devclass")
/* Produce the indenting, indent*2 spaces plus a '.' ahead of that to
* prevent syslog from deleting initial spaces
*/
#define indentprintf(p) do { int iJ; printf("."); for (iJ=0; iJ<indent; iJ++) printf(" "); printf p ; } while(0)
static void print_method_list(device_method_t *m, int indent);
static void print_device_ops(device_ops_t ops, int indent);
static void print_device_short(device_t dev, int indent);
static void print_device(device_t dev, int indent);
void print_device_tree_short(device_t dev, int indent);
void print_device_tree(device_t dev, int indent);
static void print_driver_short(driver_t *driver, int indent);
static void print_driver(driver_t *driver, int indent);
static void print_driver_list(driver_list_t drivers, int indent);
static void print_devclass_short(devclass_t dc, int indent);
static void print_devclass(devclass_t dc, int indent);
void print_devclass_list_short(void);
void print_devclass_list(void);
#else
/* Make the compiler ignore the function calls */
#define PDEBUG(a) /* nop */
#define DEVICENAME(d) /* nop */
#define DRIVERNAME(d) /* nop */
#define DEVCLANAME(d) /* nop */
#define print_method_list(m,i) /* nop */
#define print_device_ops(o,i) /* nop */
#define print_device_short(d,i) /* nop */
#define print_device(d,i) /* nop */
#define print_device_tree_short(d,i) /* nop */
#define print_device_tree(d,i) /* nop */
#define print_driver_short(d,i) /* nop */
#define print_driver(d,i) /* nop */
#define print_driver_list(d,i) /* nop */
#define print_devclass_short(d,i) /* nop */
#define print_devclass(d,i) /* nop */
#define print_devclass_list_short() /* nop */
#define print_devclass_list() /* nop */
#endif
/*
* Method table handling
*/
static int next_method_offset = 1;
static int methods_count = 0;
static int methods_size = 0;
struct method {
int offset;
char* name;
};
static struct method *methods = 0;
static void
register_method(struct device_op_desc *desc)
{
int i;
struct method* m;
for (i = 0; i < methods_count; i++)
if (!strcmp(methods[i].name, desc->name)) {
desc->offset = methods[i].offset;
PDEBUG(("methods[%d] has the same name, %s, with offset %d",
i, desc->name, desc->offset));
return;
}
if (methods_count == methods_size) {
struct method* p;
methods_size += 10;
p = (struct method*) malloc(methods_size * sizeof(struct method),
M_DEVBUF, M_NOWAIT);
if (!p)
panic("register_method: out of memory");
if (methods) {
bcopy(methods, p, methods_count * sizeof(struct method));
free(methods, M_DEVBUF);
}
methods = p;
}
m = &methods[methods_count++];
m->name = malloc(strlen(desc->name) + 1, M_DEVBUF, M_NOWAIT);
if (!m->name)
panic("register_method: out of memory");
strcpy(m->name, desc->name);
desc->offset = m->offset = next_method_offset++;
}
static int error_method(void)
{
return ENXIO;
}
static struct device_ops null_ops = {
1,
{ error_method }
};
static void
compile_methods(driver_t *driver)
{
device_ops_t ops;
struct device_method *m;
int i;
/*
* First register any methods which need it.
*/
for (i = 0, m = driver->methods; m->desc; i++, m++)
if (!m->desc->offset)
register_method(m->desc);
else
PDEBUG(("offset not equal to zero, method desc %d left as is", i));
/*
* Then allocate the compiled op table.
*/
ops = malloc(sizeof(struct device_ops) + (next_method_offset-1) * sizeof(devop_t),
M_DEVBUF, M_NOWAIT);
if (!ops)
panic("compile_methods: out of memory");
ops->maxoffset = next_method_offset;
for (i = 0; i < next_method_offset; i++)
ops->methods[i] = error_method;
for (i = 0, m = driver->methods; m->desc; i++, m++)
ops->methods[m->desc->offset] = m->func;
PDEBUG(("%s has %d method%s, wasting %d bytes",
DRIVERNAME(driver), i, (i==1?"":"s"),
(next_method_offset-i)*sizeof(devop_t)));
driver->ops = ops;
}
/*
* Devclass implementation
*/
static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses);
static devclass_t
devclass_find_internal(const char *classname, int create)
{
devclass_t dc;
PDEBUG(("looking for %s", classname));
if (!classname)
return NULL;
for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link))
if (!strcmp(dc->name, classname))
return dc;
PDEBUG(("%s not found%s", classname, (create? ", creating": "")));
if (create) {
dc = malloc(sizeof(struct devclass) + strlen(classname) + 1,
M_DEVBUF, M_NOWAIT);
if (!dc)
return NULL;
dc->name = (char*) (dc + 1);
strcpy(dc->name, classname);
dc->devices = NULL;
dc->maxunit = 0;
dc->nextunit = 0;
TAILQ_INIT(&dc->drivers);
TAILQ_INSERT_TAIL(&devclasses, dc, link);
}
return dc;
}
devclass_t
devclass_find(const char *classname)
{
return devclass_find_internal(classname, FALSE);
}
int
devclass_add_driver(devclass_t dc, driver_t *driver)
{
PDEBUG(("%s", DRIVERNAME(driver)));
/*
* Compile the drivers methods.
*/
compile_methods(driver);
/*
* Make sure the devclass which the driver is implementing exists.
*/
devclass_find_internal(driver->name, TRUE);
TAILQ_INSERT_TAIL(&dc->drivers, driver, link);
return 0;
}
int
devclass_delete_driver(devclass_t busclass, driver_t *driver)
{
devclass_t dc = devclass_find(driver->name);
device_t dev;
int i;
int error;
PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
if (!dc)
return 0;
/*
* Disassociate from any devices. We iterate through all the
* devices in the devclass of the driver and detach any which are
* using the driver.
*/
for (i = 0; i < dc->maxunit; i++) {
if (dc->devices[i]) {
dev = dc->devices[i];
if (dev->driver == driver) {
if (error = device_detach(dev))
return error;
device_set_driver(dev, NULL);
}
}
}
TAILQ_REMOVE(&busclass->drivers, driver, link);
return 0;
}
driver_t *
devclass_find_driver(devclass_t dc, const char *classname)
{
driver_t *driver;
PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));
for (driver = TAILQ_FIRST(&dc->drivers); driver;
driver = TAILQ_NEXT(driver, link)) {
if (!strcmp(driver->name, classname))
return driver;
}
PDEBUG(("not found"));
return NULL;
}
const char *
devclass_get_name(devclass_t dc)
{
return dc->name;
}
device_t
devclass_get_device(devclass_t dc, int unit)
{
if (unit < 0 || unit >= dc->maxunit)
return NULL;
return dc->devices[unit];
}
void *
devclass_get_softc(devclass_t dc, int unit)
{
device_t dev;
if (unit < 0 || unit >= dc->maxunit)
return NULL;
dev = dc->devices[unit];
if (!dev || dev->state < DS_ATTACHED)
return NULL;
return dev->softc;
}
int
devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp)
{
int i;
int count;
device_t *list;
count = 0;
for (i = 0; i < dc->maxunit; i++)
if (dc->devices[i])
count++;
list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT);
if (!list)
return ENOMEM;
count = 0;
for (i = 0; i < dc->maxunit; i++)
if (dc->devices[i]) {
list[count] = dc->devices[i];
count++;
}
*devlistp = list;
*devcountp = count;
return 0;
}
int
devclass_get_maxunit(devclass_t dc)
{
return dc->maxunit;
}
static int
devclass_alloc_unit(devclass_t dc, int *unitp)
{
int unit = *unitp;
PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc)));
/*
* If we have been given a wired unit number, check for existing
* device.
*/
if (unit != -1) {
device_t dev;
dev = devclass_get_device(dc, unit);
if (dev) {
printf("devclass_alloc_unit: %s%d already exists, using next available unit number\n", dc->name, unit);
unit = -1;
}
}
if (unit == -1) {
unit = dc->nextunit;
dc->nextunit++;
} else if (dc->nextunit <= unit)
dc->nextunit = unit + 1;
if (unit >= dc->maxunit) {
device_t *newlist;
int newsize;
newsize = (dc->maxunit ? 2 * dc->maxunit
: MINALLOCSIZE / sizeof(device_t));
newlist = malloc(sizeof(device_t) * newsize, M_DEVBUF, M_NOWAIT);
if (!newlist)
return ENOMEM;
bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit);
bzero(newlist + dc->maxunit,
sizeof(device_t) * (newsize - dc->maxunit));
if (dc->devices)
free(dc->devices, M_DEVBUF);
dc->devices = newlist;
dc->maxunit = newsize;
}
PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc)));
*unitp = unit;
return 0;
}
static int
devclass_add_device(devclass_t dc, device_t dev)
{
int error;
PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
if (error = devclass_alloc_unit(dc, &dev->unit))
return error;
dc->devices[dev->unit] = dev;
dev->devclass = dc;
return 0;
}
static int
devclass_delete_device(devclass_t dc, device_t dev)
{
if (!dc || !dev)
return 0;
PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
if (dev->devclass != dc
|| dc->devices[dev->unit] != dev)
panic("devclass_delete_device: inconsistent device class");
dc->devices[dev->unit] = NULL;
if (dev->flags & DF_WILDCARD)
dev->unit = -1;
dev->devclass = NULL;
while (dc->nextunit > 0 && dc->devices[dc->nextunit - 1] == NULL)
dc->nextunit--;
return 0;
}
static device_t
make_device(device_t parent, const char *name,
int unit, void *ivars)
{
device_t dev;
devclass_t dc;
int error;
PDEBUG(("%s at %s as unit %d with%s ivars",
name, DEVICENAME(parent), unit, (ivars? "":"out")));
if (name) {
dc = devclass_find_internal(name, TRUE);
if (!dc) {
printf("make_device: can't find device class %s\n", name);
return NULL;
}
if (error = devclass_alloc_unit(dc, &unit))
return NULL;
} else
dc = NULL;
dev = malloc(sizeof(struct device), M_DEVBUF, M_NOWAIT);
if (!dev)
return 0;
dev->parent = parent;
TAILQ_INIT(&dev->children);
dev->ops = &null_ops;
dev->driver = NULL;
dev->devclass = dc;
dev->unit = unit;
dev->desc = NULL;
dev->busy = 0;
dev->flags = DF_ENABLED;
if (unit == -1)
dev->flags |= DF_WILDCARD;
if (name)
dev->flags |= DF_FIXEDCLASS;
dev->ivars = ivars;
dev->softc = NULL;
if (dc)
dc->devices[unit] = dev;
dev->state = DS_NOTPRESENT;
return dev;
}
static void
device_print_child(device_t dev, device_t child)
{
printf("%s%d", device_get_name(child), device_get_unit(child));
if (device_is_alive(child)) {
if (device_get_desc(child))
printf(": <%s>", device_get_desc(child));
BUS_PRINT_CHILD(dev, child);
} else
printf(" not found");
printf("\n");
}
device_t
device_add_child(device_t dev, const char *name, int unit, void *ivars)
{
device_t child;
PDEBUG(("%s at %s as unit %d with%s ivars",
name, DEVICENAME(dev), unit, (ivars? "":"out")));
child = make_device(dev, name, unit, ivars);
if (child)
TAILQ_INSERT_TAIL(&dev->children, child, link);
else
PDEBUG(("%s failed", name));
return child;
}
device_t
device_add_child_after(device_t dev, device_t place, const char *name,
int unit, void *ivars)
{
device_t child;
PDEBUG(("%s at %s after %s as unit %d with%s ivars",
name, DEVICENAME(dev), DEVICENAME(place), unit, (ivars? "":"out")));
child = make_device(dev, name, unit, ivars);
if (place) {
TAILQ_INSERT_AFTER(&dev->children, place, dev, link);
} else {
TAILQ_INSERT_HEAD(&dev->children, dev, link);
}
return child;
}
int
device_delete_child(device_t dev, device_t child)
{
int error;
device_t grandchild;
PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev)));
/* remove children first */
while ( (grandchild = TAILQ_FIRST(&child->children)) ) {
error = device_delete_child(child, grandchild);
if (error)
return error;
}
if (error = device_detach(child))
return error;
if (child->devclass)
devclass_delete_device(child->devclass, child);
TAILQ_REMOVE(&dev->children, child, link);
free(child, M_DEVBUF);
return 0;
}
/*
* Find only devices attached to this bus.
*/
device_t
device_find_child(device_t dev, const char *classname, int unit)
{
devclass_t dc;
device_t child;
dc = devclass_find(classname);
if (!dc)
return NULL;
child = devclass_get_device(dc, unit);
if (child && child->parent == dev)
return child;
return NULL;
}
static driver_t *
first_matching_driver(devclass_t dc, device_t dev)
{
if (dev->devclass)
return devclass_find_driver(dc, dev->devclass->name);
else
return TAILQ_FIRST(&dc->drivers);
}
static driver_t *
next_matching_driver(devclass_t dc, device_t dev, driver_t *last)
{
if (dev->devclass) {
driver_t *driver;
for (driver = TAILQ_NEXT(last, link); driver;
driver = TAILQ_NEXT(driver, link))
if (!strcmp(dev->devclass->name, driver->name))
return driver;
return NULL;
} else
return TAILQ_NEXT(last, link);
}
static int
device_probe_child(device_t dev, device_t child)
{
devclass_t dc;
driver_t *driver;
dc = dev->devclass;
if (dc == NULL)
panic("device_probe_child: parent device has no devclass");
if (child->state == DS_ALIVE)
return 0;
for (driver = first_matching_driver(dc, child);
driver;
driver = next_matching_driver(dc, child, driver)) {
PDEBUG(("Trying %s", DRIVERNAME(driver)));
device_set_driver(child, driver);
if (DEVICE_PROBE(child) == 0) {
if (!child->devclass)
device_set_devclass(child, driver->name);
child->state = DS_ALIVE;
return 0;
}
}
return ENXIO;
}
device_t
device_get_parent(device_t dev)
{
return dev->parent;
}
int
device_get_children(device_t dev, device_t **devlistp, int *devcountp)
{
int count;
device_t child;
device_t *list;
count = 0;
for (child = TAILQ_FIRST(&dev->children); child;
child = TAILQ_NEXT(child, link))
count++;
list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT);
if (!list)
return ENOMEM;
count = 0;
for (child = TAILQ_FIRST(&dev->children); child;
child = TAILQ_NEXT(child, link)) {
list[count] = child;
count++;
}
*devlistp = list;
*devcountp = count;
return 0;
}
driver_t *
device_get_driver(device_t dev)
{
return dev->driver;
}
devclass_t
device_get_devclass(device_t dev)
{
return dev->devclass;
}
const char *
device_get_name(device_t dev)
{
if (dev->devclass)
return devclass_get_name(dev->devclass);
return NULL;
}
int
device_get_unit(device_t dev)
{
return dev->unit;
}
const char *
device_get_desc(device_t dev)
{
return dev->desc;
}
void
device_print_prettyname(device_t dev)
{
const char *name = device_get_name(dev);
if (name == 0)
name = "(no driver assigned)";
printf("%s%d: ", name, device_get_unit(dev));
}
void
device_printf(device_t dev, const char * fmt, ...)
{
va_list ap;
device_print_prettyname(dev);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
}
void
device_set_desc(device_t dev, const char* desc)
{
dev->desc = desc;
}
void *
device_get_softc(device_t dev)
{
return dev->softc;
}
void *
device_get_ivars(device_t dev)
{
return dev->ivars;
}
device_state_t
device_get_state(device_t dev)
{
return dev->state;
}
void
device_enable(device_t dev)
{
dev->flags |= DF_ENABLED;
}
void
device_disable(device_t dev)
{
dev->flags &= ~DF_ENABLED;
}
void
device_busy(device_t dev)
{
if (dev->state < DS_ATTACHED)
panic("device_busy: called for unattached device");
if (dev->busy == 0 && dev->parent)
device_busy(dev->parent);
dev->busy++;
dev->state = DS_BUSY;
}
void
device_unbusy(device_t dev)
{
if (dev->state != DS_BUSY)
panic("device_unbusy: called for non-busy device");
dev->busy--;
if (dev->busy == 0) {
if (dev->parent)
device_unbusy(dev->parent);
dev->state = DS_ATTACHED;
}
}
int
device_is_enabled(device_t dev)
{
return (dev->flags & DF_ENABLED) != 0;
}
int
device_is_alive(device_t dev)
{
return dev->state >= DS_ALIVE;
}
int
device_set_devclass(device_t dev, const char *classname)
{
devclass_t dc;
if (dev->devclass) {
printf("device_set_devclass: device class already set\n");
return EINVAL;
}
dc = devclass_find_internal(classname, TRUE);
if (!dc)
return ENOMEM;
return devclass_add_device(dc, dev);
}
int
device_set_driver(device_t dev, driver_t *driver)
{
if (dev->state >= DS_ATTACHED)
return EBUSY;
if (dev->driver == driver)
return 0;
if (dev->softc) {
free(dev->softc, M_DEVBUF);
dev->softc = NULL;
}
dev->ops = &null_ops;
dev->driver = driver;
if (driver) {
dev->ops = driver->ops;
dev->softc = malloc(driver->softc, M_DEVBUF, M_NOWAIT);
if (!dev->softc) {
dev->ops = &null_ops;
dev->driver = NULL;
return ENOMEM;
}
bzero(dev->softc, driver->softc);
}
return 0;
}
int
device_probe_and_attach(device_t dev)
{
device_t bus = dev->parent;
int error = 0;
if (dev->state >= DS_ALIVE)
return 0;
if (dev->flags & DF_ENABLED) {
error = device_probe_child(bus, dev);
if (!error) {
device_print_child(bus, dev);
error = DEVICE_ATTACH(dev);
if (!error)
dev->state = DS_ATTACHED;
else {
printf("device_probe_and_attach: %s%d attach returned %d\n",
dev->driver->name, dev->unit, error);
device_set_driver(dev, NULL);
dev->state = DS_NOTPRESENT;
}
}
} else {
device_print_prettyname(dev);
printf("not probed (disabled)\n");
}
return error;
}
int
device_detach(device_t dev)
{
int error;
PDEBUG(("%s", DEVICENAME(dev)));
if (dev->state == DS_BUSY)
return EBUSY;
if (dev->state != DS_ATTACHED)
return 0;
if (error = DEVICE_DETACH(dev))
return error;
if (!(dev->flags & DF_FIXEDCLASS))
devclass_delete_device(dev->devclass, dev);
dev->state = DS_NOTPRESENT;
device_set_driver(dev, NULL);
return 0;
}
int
device_shutdown(device_t dev)
{
if (dev->state < DS_ATTACHED)
return 0;
return DEVICE_SHUTDOWN(dev);
}
/*
* Access functions for device resources.
*/
extern struct config_device devtab[];
extern int devtab_count;
static int
resource_match_string(int i, char *resname, char *value)
{
int j;
struct config_resource *res;
for (j = 0, res = devtab[i].resources;
j < devtab[i].resource_count; j++, res++)
if (!strcmp(res->name, resname)
&& res->type == RES_STRING
&& !strcmp(res->u.stringval, value))
return TRUE;
return FALSE;
}
static int
resource_find(const char *name, int unit, char *resname,
struct config_resource **result)
{
int i, j;
struct config_resource *res;
/*
* First check specific instances, then generic.
*/
for (i = 0; i < devtab_count; i++) {
if (devtab[i].unit < 0)
continue;
if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
res = devtab[i].resources;
for (j = 0; j < devtab[i].resource_count; j++, res++)
if (!strcmp(res->name, resname)) {
*result = res;
return 0;
}
}
}
for (i = 0; i < devtab_count; i++) {
if (devtab[i].unit >= 0)
continue;
if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
res = devtab[i].resources;
for (j = 0; j < devtab[i].resource_count; j++, res++)
if (!strcmp(res->name, resname)) {
*result = res;
return 0;
}
}
}
return ENOENT;
}
int
resource_int_value(const char *name, int unit, char *resname, int *result)
{
int error;
struct config_resource *res;
if ((error = resource_find(name, unit, resname, &res)) != 0)
return error;
if (res->type != RES_INT)
return EFTYPE;
*result = res->u.intval;
return 0;
}
int
resource_long_value(const char *name, int unit, char *resname, long *result)
{
int error;
struct config_resource *res;
if ((error = resource_find(name, unit, resname, &res)) != 0)
return error;
if (res->type != RES_LONG)
return EFTYPE;
*result = res->u.longval;
return 0;
}
int
resource_string_value(const char *name, int unit, char *resname, char **result)
{
int error;
struct config_resource *res;
if ((error = resource_find(name, unit, resname, &res)) != 0)
return error;
if (res->type != RES_STRING)
return EFTYPE;
*result = res->u.stringval;
return 0;
}
int
resource_query_string(int i, char *resname, char *value)
{
if (i < 0)
i = 0;
else
i = i + 1;
for (; i < devtab_count; i++)
if (resource_match_string(i, resname, value))
return i;
return -1;
}
char *
resource_query_name(int i)
{
return devtab[i].name;
}
int
resource_query_unit(int i)
{
return devtab[i].unit;
}
/*
* Some useful method implementations to make life easier for bus drivers.
*/
int
bus_generic_attach(device_t dev)
{
device_t child;
for (child = TAILQ_FIRST(&dev->children);
child; child = TAILQ_NEXT(child, link))
device_probe_and_attach(child);
return 0;
}
int
bus_generic_detach(device_t dev)
{
device_t child;
int error;
if (dev->state != DS_ATTACHED)
return EBUSY;
for (child = TAILQ_FIRST(&dev->children);
child; child = TAILQ_NEXT(child, link))
if (error = device_detach(child))
return error;
return 0;
}
int
bus_generic_shutdown(device_t dev)
{
device_t child;
for (child = TAILQ_FIRST(&dev->children);
child; child = TAILQ_NEXT(child, link))
DEVICE_SHUTDOWN(child);
return 0;
}
int
bus_generic_suspend(device_t dev)
{
int error;
device_t child, child2;
for (child = TAILQ_FIRST(&dev->children);
child; child = TAILQ_NEXT(child, link)) {
error = DEVICE_SUSPEND(child);
if (error) {
for (child2 = TAILQ_FIRST(&dev->children);
child2 && child2 != child;
child2 = TAILQ_NEXT(child2, link))
DEVICE_RESUME(child2);
return (error);
}
}
return 0;
}
int
bus_generic_resume(device_t dev)
{
device_t child;
for (child = TAILQ_FIRST(&dev->children);
child; child = TAILQ_NEXT(child, link)) {
DEVICE_RESUME(child);
/* if resume fails, there's nothing we can usefully do... */
}
return 0;
}
void
bus_generic_print_child(device_t dev, device_t child)
{
printf(" on %s%d", device_get_name(dev), device_get_unit(dev));
}
int
bus_generic_read_ivar(device_t dev, device_t child, int index,
uintptr_t * result)
{
return ENOENT;
}
int
bus_generic_write_ivar(device_t dev, device_t child, int index,
uintptr_t value)
{
return ENOENT;
}
int
bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq,
driver_intr_t *intr, void *arg, void **cookiep)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_SETUP_INTR(dev->parent, child, irq, intr, arg,
cookiep));
else
return (EINVAL);
}
int
bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq,
void *cookie)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie));
else
return (EINVAL);
}
struct resource *
bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_ALLOC_RESOURCE(dev->parent, child, type, rid,
start, end, count, flags));
else
return (NULL);
}
int
bus_generic_release_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_RELEASE_RESOURCE(dev->parent, child, type, rid,
r));
else
return (EINVAL);
}
int
bus_generic_activate_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid,
r));
else
return (EINVAL);
}
int
bus_generic_deactivate_resource(device_t dev, device_t child, int type,
int rid, struct resource *r)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid,
r));
else
return (EINVAL);
}
/*
* Some convenience functions to make it easier for drivers to use the
* resource-management functions. All these really do is hide the
* indirection through the parent's method table, making for slightly
* less-wordy code. In the future, it might make sense for this code
* to maintain some sort of a list of resources allocated by each device.
*/
struct resource *
bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end,
u_long count, u_int flags)
{
if (dev->parent == 0)
return (0);
return (BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end,
count, flags));
}
int
bus_activate_resource(device_t dev, int type, int rid, struct resource *r)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
}
int
bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
}
int
bus_release_resource(device_t dev, int type, int rid, struct resource *r)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_RELEASE_RESOURCE(dev->parent, dev,
type, rid, r));
}
static void
root_print_child(device_t dev, device_t child)
{
}
static int
root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg,
void **cookiep)
{
/*
* If an interrupt mapping gets to here something bad has happened.
*/
panic("root_setup_intr");
}
static device_method_t root_methods[] = {
/* Device interface */
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, root_print_child),
DEVMETHOD(bus_read_ivar, bus_generic_read_ivar),
DEVMETHOD(bus_write_ivar, bus_generic_write_ivar),
DEVMETHOD(bus_setup_intr, root_setup_intr),
{ 0, 0 }
};
static driver_t root_driver = {
"root",
root_methods,
DRIVER_TYPE_MISC,
1, /* no softc */
};
device_t root_bus;
devclass_t root_devclass;
static int
root_bus_module_handler(module_t mod, int what, void* arg)
{
switch (what) {
case MOD_LOAD:
compile_methods(&root_driver);
root_bus = make_device(NULL, "root", 0, NULL);
root_bus->desc = "System root bus";
root_bus->ops = root_driver.ops;
root_bus->driver = &root_driver;
root_bus->state = DS_ATTACHED;
root_devclass = devclass_find_internal("root", FALSE);
return 0;
}
return 0;
}
static moduledata_t root_bus_mod = {
"rootbus",
root_bus_module_handler,
0
};
DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
void
root_bus_configure(void)
{
device_t dev;
PDEBUG(("."));
for (dev = TAILQ_FIRST(&root_bus->children); dev;
dev = TAILQ_NEXT(dev, link)) {
device_probe_and_attach(dev);
}
}
int
driver_module_handler(module_t mod, int what, void *arg)
{
int error, i;
struct driver_module_data *dmd;
devclass_t bus_devclass;
dmd = (struct driver_module_data *)arg;
bus_devclass = devclass_find_internal(dmd->dmd_busname, TRUE);
error = 0;
switch (what) {
case MOD_LOAD:
for (i = 0; !error && i < dmd->dmd_ndrivers; i++) {
PDEBUG(("Loading module: driver %s on bus %s",
DRIVERNAME(dmd->dmd_drivers[i]),
dmd->dmd_busname));
error = devclass_add_driver(bus_devclass,
dmd->dmd_drivers[i]);
}
if (error)
break;
/*
* The drivers loaded in this way are assumed to all
* implement the same devclass.
*/
*dmd->dmd_devclass =
devclass_find_internal(dmd->dmd_drivers[0]->name,
TRUE);
break;
case MOD_UNLOAD:
for (i = 0; !error && i < dmd->dmd_ndrivers; i++) {
PDEBUG(("Unloading module: driver %s from bus %s",
DRIVERNAME(dmd->dmd_drivers[i]),
dmd->dmd_busname));
error = devclass_delete_driver(bus_devclass,
dmd->dmd_drivers[i]);
}
break;
}
if (!error && dmd->dmd_chainevh)
error = dmd->dmd_chainevh(mod, what, dmd->dmd_chainarg);
return (error);
}
#ifdef BUS_DEBUG
/* the _short versions avoid iteration by not calling anything that prints
* more than oneliners. I love oneliners.
*/
static void
print_method_list(device_method_t *m, int indent)
{
int i;
if (!m)
return;
for (i = 0; m->desc; i++, m++)
indentprintf(("method %d: %s, offset=%d\n",
i, m->desc->name, m->desc->offset));
}
static void
print_device_ops(device_ops_t ops, int indent)
{
int i;
int count = 0;
if (!ops)
return;
/* we present a list of the methods that are pointing to the
* error_method, but ignore the 0'th elements; it is always
* error_method.
*/
for (i = 1; i < ops->maxoffset; i++) {
if (ops->methods[i] == error_method) {
if (count == 0)
indentprintf(("error_method:"));
printf(" %d", i);
count++;
}
}
if (count)
printf("\n");
indentprintf(("(%d method%s, %d valid, %d error_method%s)\n",
ops->maxoffset-1, (ops->maxoffset-1 == 1? "":"s"),
ops->maxoffset-1-count,
count, (count == 1? "":"'s")));
}
static void
print_device_short(device_t dev, int indent)
{
if (!dev)
return;
indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%sivars,%ssoftc,busy=%d\n",
dev->unit, dev->desc,
(dev->parent? "":"no "),
(TAILQ_EMPTY(&dev->children)? "no ":""),
(dev->flags&DF_ENABLED? "enabled,":"disabled,"),
(dev->flags&DF_FIXEDCLASS? "fixed,":""),
(dev->flags&DF_WILDCARD? "wildcard,":""),
(dev->ivars? "":"no "),
(dev->softc? "":"no "),
dev->busy));
}
static void
print_device(device_t dev, int indent)
{
if (!dev)
return;
print_device_short(dev, indent);
indentprintf(("Parent:\n"));
print_device_short(dev->parent, indent+1);
indentprintf(("Methods:\n"));
print_device_ops(dev->ops, indent+1);
indentprintf(("Driver:\n"));
print_driver_short(dev->driver, indent+1);
indentprintf(("Devclass:\n"));
print_devclass_short(dev->devclass, indent+1);
}
void
print_device_tree_short(device_t dev, int indent)
/* print the device and all its children (indented) */
{
device_t child;
if (!dev)
return;
print_device_short(dev, indent);
for (child = TAILQ_FIRST(&dev->children); child;
child = TAILQ_NEXT(child, link))
print_device_tree_short(child, indent+1);
}
void
print_device_tree(device_t dev, int indent)
/* print the device and all its children (indented) */
{
device_t child;
if (!dev)
return;
print_device(dev, indent);
for (child = TAILQ_FIRST(&dev->children); child;
child = TAILQ_NEXT(child, link))
print_device_tree(child, indent+1);
}
static void
print_driver_short(driver_t *driver, int indent)
{
if (!driver)
return;
indentprintf(("driver %s: type = %s%s%s%s, softc size = %d\n",
driver->name,
/* yes, I know this looks silly, but going to bed at
* two o'clock and having to get up at 7:30 again is silly
* as well. As is sticking your head in a bucket of water.
*/
(driver->type == DRIVER_TYPE_TTY? "tty":""),
(driver->type == DRIVER_TYPE_BIO? "bio":""),
(driver->type == DRIVER_TYPE_NET? "net":""),
(driver->type == DRIVER_TYPE_MISC? "misc":""),
driver->softc));
}
static void
print_driver(driver_t *driver, int indent)
{
if (!driver)
return;
print_driver_short(driver, indent);
indentprintf(("Methods:\n"));
print_method_list(driver->methods, indent+1);
indentprintf(("Operations:\n"));
print_device_ops(driver->ops, indent+1);
}
static void
print_driver_list(driver_list_t drivers, int indent)
{
driver_t *driver;
for (driver = TAILQ_FIRST(&drivers); driver;
driver = TAILQ_NEXT(driver, link))
print_driver(driver, indent);
}
static void
print_devclass_short(devclass_t dc, int indent)
{
if ( !dc )
return;
indentprintf(("devclass %s: max units = %d, next unit = %d\n",
dc->name, dc->maxunit, dc->nextunit));
}
static void
print_devclass(devclass_t dc, int indent)
{
int i;
if ( !dc )
return;
print_devclass_short(dc, indent);
indentprintf(("Drivers:\n"));
print_driver_list(dc->drivers, indent+1);
indentprintf(("Devices:\n"));
for (i = 0; i < dc->maxunit; i++)
if (dc->devices[i])
print_device(dc->devices[i], indent+1);
}
void
print_devclass_list_short(void)
{
devclass_t dc;
printf("Short listing of devclasses, drivers & devices:\n");
for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link))
print_devclass_short(dc, 0);
}
void
print_devclass_list(void)
{
devclass_t dc;
printf("Full listing of devclasses, drivers & devices:\n");
for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link))
print_devclass(dc, 0);
}
#endif
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